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Source: http://blog.sina.com.cn/s/blog_3ef1296d0101aob6.html three, FPGA pin allocation file Preservation methodWhen using someone else's project, sometimes can't find his pin file, but can save his already bound pin, output to the file.method One:View pin bindings, Quartus-Assignment, Pins, open the FPGA pin interface, where the pin file can be saved in CSV format (tabular format) and TCL format in t

ArticleDirectory Introduction Build HDL Hardware settings Software Development Statement: This article is original works, copyright belongs to the author of this blog, If You Need To reprint, please indicate the source of http://www.cnblogs.com/kingst/ Introduction As an embedded software-core processor built on FPGA, niosii can add any provided peripherals as needed, you can also customize user logic peripherals and Custom Us

1. Asynchronous resetAlways @ (Posedge sclk or Negedge s_rst_n)if (!s_rst_n)D_out else D_out The consolidated RTL view is as follows:You can see that the register d_out has a low-level effective reset signal S_rst_n port, even if the design is high power level, the actual synthesis will also reverse the asynchronous reset signal back to the CLRN end;2. Synchronous resetAlways @ (Posedge sclk)if (!s_rst_n)D_out else D_out The consolidated RTL view is as follows:It can be seen that the synchronous

1 speed and area The overall speed and area optimization will implement the logical topology that RTL will use. For FPGA, because of the lack of backend knowledge, comprehensive tools will mainly implement door-level optimization. Generally, higher speed requires higher concurrency and larger area, but this is not the case in some special cases. Because the layout and wiring of FPGA have a second-order effe

When FPGA area optimization 1 does not require high speed, we can design the pipeline into an iterative form to reuse resources with the same FPGA functionality. 2. When the control logic is smaller than the sharing logic, the control logic resources can be used for reuse. For example, in the implementation of the FIR filter, the multiplier is a shared resource. We can implement the state machine by contro

Link: http://www.altera.com.cn/literature/wp/wp-01166-bdti-altera-floating-point-dsp.pdf In the future, it will be more meaningful to conduct a comparison test of Xilinx DSP architecture FPGA based on the testing method in this article. But remember: the human brain is the best optimizer! Introduction: OverviewFPGAs are increasingly used as Parallel Processing engines for demanding digitalSignal processing applications. benchmark results show that on

I. Summary Summarize the distribution and storage methods of FPGA pins in US us II. Ii. Pin Allocation Method In addition to qii software, you can select the "assignments-> pin" label (or click the button) to open the pin planner and assign the pin. The following two methods are available for Pin allocation. Method 1: Import assignments Step 1: Use notepad or similar software to create a TXT file (or CSV file) and write the pin distribu

In FPGA code design, remember to have a "principle". For three-state ports, try to use three-state ports in the top-layer modules instead of internal sub-modules. Otherwise, there will be a series of problems, I have always followed this principle to design the code. The figure shows a little curious. in the computer, most modules mounted on the bus are in three states, as a result, each of the three-state sub-modules connects to the outside through a

to be followed when they are used. 7. Unexpected pain points may occur when IP addresses are used. Therefore, do not use assumptions to imagine the Module Settings. Instead, try to adapt to the environment and configure your own design. As an FPGA player, this ability to change according to the environment is required. 8. Considering cashes settings, there are two types of cash: one is used for instruction caching and the other is used for d

prompting you to design the output of the BUFG to a non-clock pin, which is the ILA logic.In S6, it is recommended that the global clock output only connect to the clock pins, otherwise it is difficult to cause cabling problems easily. The constraint of adding clock_dedicated_route can reduce this error to alarm and continue to run layout and cabling. It is important to note that this constraint does not force the CLK_WE signal to pass through BUFG, but rather tells the tool to ignore such non-

Fanout, that is, fan-out, refers to the module directly called the number of sub-modules, if this value is too large, the FPGA directly displayed as net delay is larger, not conducive to timing convergence. Therefore, you should try to avoid high fan-out when writing code. However, in some special cases, the need of the overall structure design or the inability to modify the code constraints, you need to solve the problem of high fan out through other

) Synchronization of data between MCU side and FPGA end.SPI data from the MCU output, MCU and FPGA is not the same clock domain, you can use the simplest D trigger to achieve data synchronization. The edge detection of the rising edge requires two D flip-flops, in order to ensure the synchronization of the SPI data, the other signals are also synchronized through two levels of trigger output.Access Spi_data

Design Concept of FPGA Asynchronous FIFO (2) First, we will discuss the Gray code encoding method: Let's first look at the 4-bit gray code. When MSB is 0, the positive count is displayed. When MSB is 1, that is, the pointer has already passed through, and the highest digit is flipped. At this time, the gray code is counted in reverse order, the entire set of data is symmetric centered on the maximum value (depth), and each number meets the Gray code

1 Module my_multiport_component ( 2 // Signals for aveon-mm slave port "S1" 3 Avs_s1_clk, 4 Avs_s1_reset_n, 5 Avs_s1_address, 6 Avs_s1_read, 7 Avs_s1_write, 8 Avs_s1_writedata, 9 Avs_s1_readdata, 10 Avs_s1_export_dac_output, 11 // Signals for aveon-mm slave port "S2" 12 Avs_s2_address, 13 Avs_s2_read, 14 Avs_s2_readdata, 15 Avs_s2_export_dac_output, 16 // Clock/Reset Interface 17 Csi_clockreset_clk 18 );

The zero crossing detection method is the function of the comparator. It can convert a sine wave of a certain frequency into a square wave or a pulse wave. This is necessary in the test frequency and other places, because FPGA only recognizes the edge, but does not recognize the sine wave. The algorithm is divided into two parts: the determination of the zero point and the generation of the pulse wave. Why do we need to determine the zero point. We

compile-compile all. 5. Select the library tag, find work, and click + to expand 6. Right-click the compiled. V file and select simulate without optimization. 7. The sim tab is displayed. Right-click the file to be simulated and select Add wave. 8. Set the simulation time, for example, 1000ns 9. Click Run in the toolbar. Figure 3 shows lfsr simulation results Figure 3: lfsr simulation waveform Analysis: The software used for analysis is mainly chipscope pro. For details about how to use chipsc

FPGA simulation, mainly including FPGA manufacturer software simulation and third-party edatool simulation. If you use quartuⅱ software, there are two methods: function and timing. Function:After synthesis, execute the generate function simulation netlist to implement it, with a door latency. Timing:It must be completed after compile, including the door latency and path latency. If Modelsim edatool

Document directory 3.1.1 fixed parameter launch edge, latch edge, Tsu, th, and TCO concepts 3.1.2 clock skew 3.1.3 data arrival time 3.1.4 clock arrival time 3.1.5 data required time (Setup/hold) 3.1.6 setup slack 3.1.7 minimum clock cycle 4.1.1 single-clock Constraints 4.4.1 Synplify timing report 4.4.2 designer smarttime Sequence Analysis Report 4.4.3 detailed Time Series Report Diagram 1. Applicability This document applies to actel FPGA